"These are basically an extremely stupid marketing gimmick which is medically BAD. Your whole body, and especially your muscles, depend on the circulation of blood through arteries and veins and plasma/lymph through the secondary circulation system. Compression clothing will restrict this blood and lymph flow. Your extremities will suffer from decreased supply of ATP and slower removal of lactic acid."
It actually doesn't look like that is true, Roger. However, it doesn't seem like they would be that useful for hiking, unless you were mostly wearing them on a rest/recovery day following a hard hiking day. I don't think I would sleep in them, which may have led to the problems you had. Also, I wouldn't be inclined to wear them in the cold, where restriction might cause some serious problems. For what it's worth, I am a runner but have never worn compression socks.
This blog seems to have a decent synopsis of where the science is on compression socks for running:
Also, Joe Friel's blog:
Edit: I forgot a word